+++ /dev/null
-/*
- subnet.c -- handle subnet lookups and lists
- Copyright (C) 2000-2013 Guus Sliepen <guus@tinc-vpn.org>,
- 2000-2005 Ivo Timmermans
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-
-#include "system.h"
-
-#include "splay_tree.h"
-#include "control_common.h"
-#include "device.h"
-#include "hash.h"
-#include "logger.h"
-#include "names.h"
-#include "net.h"
-#include "netutl.h"
-#include "node.h"
-#include "script.h"
-#include "subnet.h"
-#include "utils.h"
-#include "xalloc.h"
-
-/* lists type of subnet */
-
-splay_tree_t *subnet_tree;
-
-/* Subnet lookup cache */
-
-hash_t *ipv4_cache;
-hash_t *ipv6_cache;
-hash_t *mac_cache;
-
-void subnet_cache_flush(void) {
- hash_clear(ipv4_cache);
- hash_clear(ipv6_cache);
- hash_clear(mac_cache);
-}
-
-/* Initialising trees */
-
-void init_subnets(void) {
- subnet_tree = splay_alloc_tree((splay_compare_t) subnet_compare, (splay_action_t) free_subnet);
-
- ipv4_cache = hash_alloc(0x100, sizeof(ipv4_t));
- ipv6_cache = hash_alloc(0x100, sizeof(ipv6_t));
- mac_cache = hash_alloc(0x100, sizeof(mac_t));
-}
-
-void exit_subnets(void) {
- splay_delete_tree(subnet_tree);
-
- hash_free(ipv4_cache);
- hash_free(ipv6_cache);
- hash_free(mac_cache);
-}
-
-splay_tree_t *new_subnet_tree(void) {
- return splay_alloc_tree((splay_compare_t) subnet_compare, NULL);
-}
-
-void free_subnet_tree(splay_tree_t *subnet_tree) {
- splay_delete_tree(subnet_tree);
-}
-
-/* Allocating and freeing space for subnets */
-
-subnet_t *new_subnet(void) {
- return xzalloc(sizeof(subnet_t));
-}
-
-void free_subnet(subnet_t *subnet) {
- free(subnet);
-}
-
-/* Adding and removing subnets */
-
-void subnet_add(node_t *n, subnet_t *subnet) {
- subnet->owner = n;
-
- splay_insert(subnet_tree, subnet);
- splay_insert(n->subnet_tree, subnet);
-
- subnet_cache_flush();
-}
-
-void subnet_del(node_t *n, subnet_t *subnet) {
- splay_delete(n->subnet_tree, subnet);
- splay_delete(subnet_tree, subnet);
-
- subnet_cache_flush();
-}
-
-/* Subnet lookup routines */
-
-subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet) {
- return splay_search(owner->subnet_tree, subnet);
-}
-
-subnet_t *lookup_subnet_mac(const node_t *owner, const mac_t *address) {
- subnet_t *r = NULL;
-
- // Check if this address is cached
-
- if((r = hash_search(mac_cache, address)))
- return r;
-
- // Search all subnets for a matching one
-
- for splay_each(subnet_t, p, owner ? owner->subnet_tree : subnet_tree) {
- if(!p || p->type != SUBNET_MAC)
- continue;
-
- if(!memcmp(address, &p->net.mac.address, sizeof *address)) {
- r = p;
- if(p->owner->status.reachable)
- break;
- }
- }
-
- // Cache the result
-
- if(r)
- hash_insert(mac_cache, address, r);
-
- return r;
-}
-
-subnet_t *lookup_subnet_ipv4(const ipv4_t *address) {
- subnet_t *r = NULL;
-
- // Check if this address is cached
-
- if((r = hash_search(ipv4_cache, address)))
- return r;
-
- // Search all subnets for a matching one
-
- for splay_each(subnet_t, p, subnet_tree) {
- if(!p || p->type != SUBNET_IPV4)
- continue;
-
- if(!maskcmp(address, &p->net.ipv4.address, p->net.ipv4.prefixlength)) {
- r = p;
- if(p->owner->status.reachable)
- break;
- }
- }
-
- // Cache the result
-
- if(r)
- hash_insert(ipv4_cache, address, r);
-
- return r;
-}
-
-subnet_t *lookup_subnet_ipv6(const ipv6_t *address) {
- subnet_t *r = NULL;
-
- // Check if this address is cached
-
- if((r = hash_search(ipv6_cache, address)))
- return r;
-
- // Search all subnets for a matching one
-
- for splay_each(subnet_t, p, subnet_tree) {
- if(!p || p->type != SUBNET_IPV6)
- continue;
-
- if(!maskcmp(address, &p->net.ipv6.address, p->net.ipv6.prefixlength)) {
- r = p;
- if(p->owner->status.reachable)
- break;
- }
- }
-
- // Cache the result
-
- if(r)
- hash_insert(ipv6_cache, address, r);
-
- return r;
-}
-
-void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
- char netstr[MAXNETSTR];
- char *name, *address, *port;
- char empty[] = "";
-
- // Prepare environment variables to be passed to the script
-
- char *envp[10] = {NULL};
- xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
- xasprintf(&envp[1], "DEVICE=%s", device ? : "");
- xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
- xasprintf(&envp[3], "NODE=%s", owner->name);
-
- if(owner != myself) {
- sockaddr2str(&owner->address, &address, &port);
- // 4 and 5 are reserved for SUBNET and WEIGHT
- xasprintf(&envp[6], "REMOTEADDRESS=%s", address);
- xasprintf(&envp[7], "REMOTEPORT=%s", port);
- free(port);
- free(address);
- }
-
- xasprintf(&envp[8], "NAME=%s", myself->name);
-
- name = up ? "subnet-up" : "subnet-down";
-
- if(!subnet) {
- for splay_each(subnet_t, subnet, owner->subnet_tree) {
- if(!net2str(netstr, sizeof netstr, subnet))
- continue;
-
- // Strip the weight from the subnet, and put it in its own environment variable
- char *weight = strchr(netstr, '#');
- if(weight)
- *weight++ = 0;
- else
- weight = empty;
-
- // Prepare the SUBNET and WEIGHT variables
- if(envp[4])
- free(envp[4]);
- if(envp[5])
- free(envp[5]);
- xasprintf(&envp[4], "SUBNET=%s", netstr);
- xasprintf(&envp[5], "WEIGHT=%s", weight);
-
- execute_script(name, envp);
- }
- } else {
- if(net2str(netstr, sizeof netstr, subnet)) {
- // Strip the weight from the subnet, and put it in its own environment variable
- char *weight = strchr(netstr, '#');
- if(weight)
- *weight++ = 0;
- else
- weight = empty;
-
- // Prepare the SUBNET and WEIGHT variables
- xasprintf(&envp[4], "SUBNET=%s", netstr);
- xasprintf(&envp[5], "WEIGHT=%s", weight);
-
- execute_script(name, envp);
- }
- }
-
- for(int i = 0; envp[i] && i < 9; i++)
- free(envp[i]);
-}
-
-bool dump_subnets(connection_t *c) {
- for splay_each(subnet_t, subnet, subnet_tree) {
- char netstr[MAXNETSTR];
-
- if(!net2str(netstr, sizeof netstr, subnet))
- continue;
-
- send_request(c, "%d %d %s %s",
- CONTROL, REQ_DUMP_SUBNETS,
- netstr, subnet->owner->name);
- }
-
- return send_request(c, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
-}
projects / meshlink / blobdiff